The Powerball multi-state lottery jackpot is worth an estimated $320 million for tonight's drawing.  That's the fourth-most-valuable jackpot in the lottery's history, according to Louisiana lottery officials.

The $320 million would be paid as an annuity spread over 30 years.  Winners could also chose a one-time cash payout, which in this drawing totals $213 million.  After taxes, a Louisiana winner would clear nearly $150 million.

"Ticket sales are going great," said Louisiana lottery spokeswoman Kimberly Chopin.  She noted it's been a few years since a Louisianan won the grand prize.

"Our last Powerball jackpot winner in Louisiana was July 2010," she said.